Restless Earth: Structure Of The Earth

Question 1

What is the difference between oceanic crust and continental crust?

Answer 1

Oceanic- more dense, less thick, made from basalt

Continental- less dense, more thick, made from granite

Question 2

How do tectonic plates move?

Answer 2

Radioactive decay in the earths core heats the mantle and generates convection currents which drives plate motion (and generates magnetic fields)

Question 3

What are the different plate boundaries?

Answer 3

Conservative- two plates slide past each other
Destructive- two plates collide and one flows under the other (subduction)
Constructive- rising convection ur rents pull crust apart forming volcanic ridge

Question 4

What are three major plate boundaries in the world?

Answer 4

• African plate
• South American plate
• Philippines plate

Question 5

What is evidence for wagners theory of continental drift?

Answer 5

• fossils of similar animals found in different continents
• same rock type in different continents
• continents fit together like a puzzle

Question 6

What layers is the earth made up off?

Answer 6

Crust-made from thin layers of tectonic plates
Mantle- divided into solid upper part and semi-liquid lower part which can flow
Core-consists of liquid outer core and solid inner core